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QLN and HLog question

Luzern
Seasoned Pro
Posts: 3,216
Thanks: 312
Fixes: 2
Registered: 31-07-2007

QLN and HLog question

The values are  always expressed as -n dB. Which is the better -n, please, larger or smaller?

No one has to agree with my opinion, but in the time I have left a miracle would be nice.
3 REPLIES
Community Veteran
Posts: 5,109
Thanks: 465
Fixes: 17
Registered: 10-06-2010

Re: QLN and HLog question

HLog: more signal is better, so -20 dB is better than -30 dB.

QLN: less noise is better, so -140 dBm/Hz is better than -120 dBm/Hz.

(the unit for QLN is dBm/Hz)

Luzern
Seasoned Pro
Posts: 3,216
Thanks: 312
Fixes: 2
Registered: 31-07-2007

Re: QLN and HLog question

@ejs Thanks for that!

The downstream QLN from tones 33 to 511 seems to have deteriorated by arithmetical average of -.588 dBm/Hz. I'm not sure if that is a valid way to calculate. Secondly my connection does not use  higher than, say, tone 320, so are the higher ones still of relevance?

No one has to agree with my opinion, but in the time I have left a miracle would be nice.
Community Veteran
Posts: 5,109
Thanks: 465
Fixes: 17
Registered: 10-06-2010

Re: QLN and HLog question

And what is 0.588 dBm/Hz in context? Less than 1%? QLN is only measured when the modem is establishing a connection, I'd expect it to vary by more than 1% from one time to another.

My line's about 10% slower than what it was 2 years ago.